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Instead of throwing away spent film canisters, a resourceful San Francisco nerd who goes by the moniker Doctor Popular managed to transform one into an interactive greeting card for his Valentine.
The idea is a simple: The greeting card -- made from paper -- mimics a strip of 35mm film with a personal greeting written on it alongside a little bit of creative decorating. The "film" is then inserted into the canister and can be read with a pull of a tab.
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If you have time on your hands this weekend, head over to this step-by-step tutorial and give it a shot. LINK
(Source: Crave Asia via PetaPixel)